The HWP binary format specification has been published online free by Hancom on June 29, 2010 (see for example https://en.wikipedia.org/wiki/Hangul_(word_processor)).

In reply to Re: Modifying .hwp (Hangul Word Processor) files without conversion by Laurent_R
in thread Modifying .hwp (Hangul Word Processor) files without conversion by Phenomanan

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